Blueberry plant named &#39;Corona&#39;

ABSTRACT

A new and distinct Blueberry cultivar is provided that is the product of a controlled breeding program followed by selection. The cultivar flowers and forms fruit at mid-season. The attractive light blue flattened-round berries exhibit a classical blueberry flavor. The plant is very strong and grows well in various soil types. The plant commonly requires cross pollination, and displays a generally vase-shaped growth habit with attractive evergreen foliage. A low chilling requirement is also exhibited.

BOTANICAL/COMMERCIAL CLASSIFICATION

Vaccinium corymbosum L./Blueberry Plant

VARIETAL DENOMINATION

cv. Corona

SUMMARY OF THE INVENTION

The new Blueberry cultivar of the present invention was the product of controlled artificial pollination carried out in a greenhouse at Greenwood, Fla., U.S.A., wherein two parents were crossed which previously had been studied in the hope that they would contribute the desired characteristics. The female parent (i.e., the seed parent) was the unreleased ‘FL 95-54’ cultivar (non-patented in the United States). The male parent (i.e., pollen parent) was the ‘Jewel’ cultivar (U.S. Plant Pat. No. 11,807). The parentage of the new cultivar can be summarized as follows:

‘FL 95-54’×‘Jewel’.

The seeds resulting from the pollination were shipped to Almonte, Huelva, Spain, where they sown during approximately 1998, small plants were obtained which were physically and biologically different from each other and selective research of the progeny was carried out. Selective study during the spring of 2002 resulted in the identification of a single plant of the new cultivar. This plant initially was designated S02-30-12.

It was found that the new Blueberry plant of the present invention displays the following combination of characteristics:

-   -   (a) flowers and forms fruit at mid-season,     -   (b) displays a generally vase-shaped growth habit with         attractive evergreen foliage that is well amenable for harvest,     -   (c) commonly requires cross pollination for a good fruit set and         quality,     -   (d) displays a low chilling requirement, and     -   (e) forms in abundance attractive large light blue         flattened-round berries that exhibit a classical blueberry         flavor.

The new cultivar well meets the needs of the horticultural industry and can be grown to advantage for the commercial production of blueberries. The plant is very strong and grows well in various soil types. The substantially round berries are well suited for machine harvest.

The new cultivar of the present invention can be distinguished from its ancestors and all other Blueberry cultivars known to its originators. When compared to the ‘Misty’ cultivar (non-patented in the United States), the ‘Misty’ cultivar forms considerably smaller berries of approximately 14 mm. When compared to the ‘Windsor’ cultivar (U.S. Plant Pat. No. 12,783), the ‘Windsor’ cultivar commonly displays a shorter growth habit that is more round in configuration. When compared to the ‘O'Neal’ cultivar (non-patented in the United States), the ‘O'Neal’ cultivar forms darker blue berries and reuires a longer chill requirement of approximately 500 hours. The new cultivar is less susceptible to Leaf Rust than the ‘Blue Crisp’ cultivar (U.S. Plant Pat. No. 11,033). When compared to the ‘Star’ cultivar (U.S. Plant Pat. No. 10,675), the ‘Star’ cultivar does not require cross-pollination for good fruit set and quality unlike the new cultivar. When compared to the ‘Biloxi’ cultivar (non-patented in the United States), the ‘Biloxi cultivar is less resistant to Stem Blight.

The new cultivar has been asexually reproduced by the rooting of cuttings beginning during the summer of 2002 at Almonte, Huelva, Spain. Such asexual propagation has shown that the characteristics of the new cultivar are firmly fixed and are stably transmitted from one generation to another. Accordingly, the new cultivar asexually reproduces in a true to type manner.

The new cultivar has been named ‘Corona’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs show in color as nearly true as it is reasonably possible to make the same in color illustrations of this character, typical plants and plant parts of the new cultivar. The plants which had been asexually reproduced by the rooting of cuttings, and were being grown outdoors at Almonte, Huelva, Spain.

FIG. 1 shows an overall view of a typical fruiting plant of the new cultivar where the generally vase-shaped growth habit is illustrated.

FIG. 2 shows typical berries of the new cultivar in various stages of maturity as well as the foliage. A one Euro coin is included for size comparison.

FIG. 3 shows a closer view of berries in various stages of maturity.

FIG. 4 shows upper (adaxial) surfaces of typical leaves of the new cultivar.

FIG. 5 shows under (abaxial) surfaces of typical leaves of the new cultivar.

DETAILED DESCRIPTION

The chart used in the identification of the colors described herein is the R.H.S. Colour Chart of The Royal Horticultural Society, London, England. Ordinary color terms are to be accorded their customary dictionary significance. The description is based on the observation of approximately five-year-old plants of the new cultivar which had been asexually reproduced by the rooting of softwood cuttings while growing outdoors at Almonte, Huelva, Spain.

-   Plant:     -   -   Growth habit.—generally vase-shaped.         -   Height.—approximately 1.8 m at 5 years of age.         -   Width.—approximately 4.5 m at 5 years of age.         -   Foliage retention.—evergreen.         -   Chill requirement.—less than approximately 300 hours. -   Foliage:     -   -   Shape.—generally obtuse to elliptic (as illustrated).         -   Length.—commonly approximately 67 mm on average.         -   Width.—commonly approximately 40 mm on average.         -   Apex.—acute.         -   Base.—generally obtuse.         -   Margin.—entire.         -   Texture.—glabrous and non-glandular.         -   Color.—Green Group 137D on the upper (adaxial) surface, and             Green Group 138B on the under (abaxial) surface. -   Flowers:     -   -   Time.—mid-season, at Almonte, Huelva, Spain, with first             flower commonly at approximately January 7^(th), and 50             percent bloom at approximately February 10^(th).         -   Number.—commonly approximately 7 flowers per bud on average.         -   Petals.—5 in number and fused into a corolla tube.         -   Fertility.—commonly not self-fertile.         -   Fragrance.—none. -   Fruit:     -   -   Time.—commonly from approximately April 15th to June 7^(th)             at Almonte, Huelva, Spain (i.e., approximately 8 weeks).         -   Shape.—generally flattened-round.         -   Height.—commonly approximately 19 mm on average.         -   Width.—commonly approximately 21 mm on average.         -   Weight.—approximately 4.76 g/berry on average when plants             were 4 years of age.         -   Fruit scar.—approximately 2.1 mm in size, and dry.         -   Immature color.—commonly near Green Group 142B with bloom,             and Yellow-Green Group 145B without bloom.         -   Mature color.—light blue, Violet-Blue Group 97A with bloom,             and Black Group 202A without bloom.         -   Productivity.—abundant, approximately 3.56 Kg/plant on             average when plants were 4 years of age.         -   Flavor.—displays a pleasant acid blueberry flavor. -   Development:     -   -   Ability to store.—the fruit stores well under refrigeration,             when stored at 8° C. approximately 100 percent of the             berries are of good quality 7 days after harvest, and when             stored at 20° C. approximately 84 percent of the berries are             of good quality 7 days after harvest.         -   Disease tolerance.—no special sensitivity to common             Blueberry diseases. such as Leaf Rust (Pucciniastrum             vaccinii) and Botrytis (Botrytis cinerea) has been             encountered during observations to date at Almonte, Huelva,             Spain. During observations to date the new cultivar is less             susceptible to Leaf Rust than the ‘Blue Crisp’ cultivar, and             is more resistant to Stem Blight than the ‘Star’ cultivar.         -   Insects.—is susceptible to aphids and thrips.         -   Cultural conditions.—is well suited for evergreen management             under tunnels, and since the plant is very strong it is well             adaptable to various types of soil.

Plants of the ‘Corona’ cultivar have not been observed under all possible environmental conditions to date, Accordingly, it is possible that the phenotypic expression may vary somewhat with changes in light intensity and duration, cultural practices, and other environmental conditions without variance in the genotype. 

1 . A new and distinct Blueberry plant that possesses the following combination of characteristics: (a) flowers and forms fruit at mid-season, (b) displays a generally vase-shaped growth habit with attractive evergreen foliage that is well amenable for harvest, (c) commonly requires cross pollination for good fruit set and quality, (d) displays a low chilling requirement, and (e) forms in abundance attractive large light blue flattened-round berries that exhibit a classical blueberry flavor; substantially as herein shown and described. 